chemistry general knowledge questions

43.

The method that cannot be used for removing permanent hardness of water is
A.     adding sodium carbonate
B.     distillation
C.     adding caustic soda
D.     boiling
Answer & Explanation

Answer: Option D

Explanation:

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44.

The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
A.     3 billion years
B.     100 years
C.     0.01 minute
D.     13 days
Answer & Explanation

Answer: Option C

Explanation:

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45.

The gas used for artificial ripening of green fruit is
A.     ethylene
B.     ethane
C.     carbon dioxide
D.     acetylene
Answer & Explanation

Answer: Option A

Explanation:

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46.

Zone refining is used for the purification of
A.     Au    B.     Ge
C.     Ag    D.     Cu
Answer & Explanation

Answer: Option B

Explanation:

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47.

The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
A.     cineole    B.     engenol
C.     geraniol    D.     limonene
Answer & Explanation

Answer: Option A

Explanation:

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48.

The molecule which has the highest percentage of ionic character among the following is
A.     HI    B.     HF
C.     HCI    D.     HBr
Answer & Explanation

Answer: Option B

Explanation:

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